He's not a hall of fame anything.
Having said that, I do think he's already a legit starter.
The boneheaded defensive plays in crunchtime are a recent thing. He's being too aggressive and playing D with his hands instead of his feet. I think our defensive philosophy is partly to blame for this. We love to slap at the ball to create deflections, and that can make life hard on an offense. But it also leads to fouls, and logic suggests that some of those fouls will occur at times when you can least afford it.
We're struggling as a team on that end of the court though... Been lit up the last three games. Break is coming at the right time.